<template>
  <form-item-wrapper :designer="designer" :field="field" :rules="rules" :design-state="designState"
                     :parent-widget="parentWidget" :parent-list="parentList" :index-of-parent-list="indexOfParentList"
                     :sub-form-row-index="subFormRowIndex" :sub-form-col-index="subFormColIndex" :sub-form-row-id="subFormRowId">
    <el-select ref="fieldEditor" v-model="fieldModel" class="full-width-input"
               :disabled="field.options.disabled"
               :size="widgetSize"
               :clearable="field.options.clearable"
               :filterable="field.options.filterable"
               :allow-create="field.options.allowCreate"
               :default-first-option="allowDefaultFirstOption"
               :automatic-dropdown="field.options.automaticDropdown"
               :multiple="field.options.multiple" :multiple-limit="field.options.multipleLimit"
               :placeholder="field.options.placeholder || i18nt('render.hint.selectPlaceholder')"
               :remote="field.options.remote" :remote-method="remoteMethod"
               @focus="handleFocusCustomEvent" @blur="handleBlurCustomEvent"
               @change="handleChangeEvent">
      <el-option v-for="item in field.options.optionItems" :key="item.value" :label="item.label"
                 :value="item.value" :disabled="item.disabled">
      </el-option>
    </el-select>
  </form-item-wrapper>
</template>

<script>
  import FormItemWrapper from './form-item-wrapper'
  import emitter from '@/utils/emitter'
  import i18n, {translate} from "@/utils/i18n";
  import fieldMixin from "@/components/form-designer/form-widget/field-widget/fieldMixin";

  export default {
    name: "select-widget",
    componentName: 'FieldWidget',  //必须固定为FieldWidget，用于接收父级组件的broadcast事件
    mixins: [emitter, fieldMixin, i18n],
    props: {
      field: Object,
      parentWidget: Object,
      parentList: Array,
      indexOfParentList: Number,
      designer: Object,

      designState: {
        type: Boolean,
        default: false
      },

      subFormRowIndex: { /* 子表单组件行索引，从0开始计数 */
        type: Number,
        default: -1
      },
      subFormColIndex: { /* 子表单组件列索引，从0开始计数 */
        type: Number,
        default: -1
      },
      subFormRowId: { /* 子表单组件行Id，唯一id且不可变 */
        type: String,
        default: ''
      },

    },
    components: {
      FormItemWrapper,
    },
    data() {
      return {
        oldFieldValue: null, //field组件change之前的值
        fieldModel: null,
        rules: [],
      }
    },
    computed: {
      allowDefaultFirstOption() {
        return (!!this.field.options.filterable && !!this.field.options.allowCreate)
      },

      remoteMethod() {
        if (!!this.field.options.remote && !!this.field.options.onRemoteQuery) {
          return this.remoteQuery
        } else {
          return undefined
        }
      },

    },
    beforeCreate() {
      /* 这里不能访问方法和属性！！ */
    },

    created() {
      /* 注意：子组件mounted在父组件created之后、父组件mounted之前触发，故子组件mounted需要用到的prop
         需要在父组件created中初始化！！ */
      this.initOptionItems()
      this.initFieldModel()
      this.registerToRefList()
      this.initEventHandler()
      this.buildFieldRules()

      this.handleOnCreated()
    },

    mounted() {
      this.handleOnMounted()
    },

    beforeUnmount() {
      this.unregisterFromRefList()
    },

    methods: {

    }
  }
</script>

<style lang="scss" scoped>
  @import "../../../../styles/global.scss"; /* form-item-wrapper已引入，还需要重复引入吗？ */

  .full-width-input {
    width: 100% !important;
  }

</style>
